Screen for stamp-mills.



"No. 656,098. PatentedAug. l4, I900. m. n. nmsc0LL. SCREEN FDR STAMP MILLS.

(Application 11188 0 m 20, 1899.)

2 Sheets$heet I,

(No Model.)

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No. 656,098. Patented Aug. 14,1900. M. R. DRISCULL.

SCREEN FOR STAMP MILLS.

(Application filed Oct. 20, 1899.)

2 Sheets-Sheet -z (No Mndal.)

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Byhmwa A rr'oR/vE rs NITE STATES MARTIN RICHARD DRISCOLL, OF FRISCO, UTAH.

SCREEN FOR STAMP-MILLS.

SPECIFICATION forming part of Letters Patent No. 656,098, dated August 14, 1900.

Application filed October 20,1899. Serial No. 734,275. (No model.)

To all whom it may concern.-

Be it known that I, MARTIN RICHARD DRIS- COLL, of Frisco, in the county of Beaver and State of Utah, have invented a new and Improved Screen for Stamp-Mills, of which the following is a full, clear, an d exact description.

The invention relates to screens for stampmills such as shown and described in the Letters Patent of the UnitedStates No. 629,242, granted to me on July 18,1899.

The object of the present invention is to provide a new and improved screen for stampmills arranged to permit of conveniently changing a Wire screen-cloth without stopping the battery and securely holding the screen-cloth in position While the battery is in use.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of my invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate cormoved. Fig. 5 is a transverse section of the improvement on the line 5 5 in Fig. 1. Fig. 6 is an enlarged end elevation of the roll of screen-cloth and its support, and Fig. 7 is an enlarged cross-section of the clamping device for the lower end of the screen.

frame B, as illustrated in Figs. 1 and 6.

separated by a vertical partition B in the sides of which are formed guideways B and similar guideways B are arranged near the tending rods 0 passing throughaslot in the V roof of the frame or mortar Aand provided with apertures 0 one of which is engaged at a time by a transverse pin 0 adapted to rest on theu'pper'edge of the topof the front A and the upper edge of the frame B to hold the gate in the desired position'that is, more or less open, according to the desired amount of discharge of the material from the stamp; mill.

tended screen-cloth portions D D unwound from the rolls of screen-cloth D D, each having its reel or core formed at the ends with toothed journals D, engaging teeth E on the horizontal members of the brackets E, bolted or otherwise fastened to the front face of the By the arrangement described the rolls D D can be adjusted transversely to bring the rear end of the roll in firm contact with the front face of. the frame B at a distance above the openings B and B and at the same time the rolls 1 are held against accidental unwinding of the; screen-cloth when the stamp-millis in use and the material in the mill exerts pressure against the inner face of the extended portion D or D Furthermore, the operator is enabled to turn the roll so as to draw the ex. tended portion tight in a vertical direction,

by turning the roll correspondingly in its bearings. By the teeth of the roll and the bracket meshing, as described, the roll is held from unwinding, andlat the sametime .the

roll can be transversely adjusted, so that.

D of the screen-cloth in position on the frame The openings 13 B are adapted to be cov ered at the front of the frame B by the ex-t- 13 over the openings B B I provide two rectangular frames F F, arranged to engage the screen-cloth at the sides, top, and bottom portions, the lower edge of the screen-cloth passing around the lower bar of a clamping-frame to be then clamped to this bar by auxiliary clamping-bars G G, held transversely adj ustable on bolts I'I, attached to the frame B. The clamping-frames F F have their openings approximately of the size of the openings BB and the outer side bars of the said frames are formed with vertical slots F engaged by bolts I, held on the frame 13. The inner adjacent bars of the said frames F F are simultaneously engaged by clamping-bolts I, held on the partition B Now by the arrangement described the bolts I I simultaneously fasten the frames F F in position; but when it is desired to adjust one of the extended portions of the screencloth then it is necessary to loosen the corresponding frame by loosening the bolts I I, and in order to hold the other clamping-frame temporarily in position when the bolts I are loosened I provide a crank-screw J, held on the partition B and adapted to engage either of the frames F or F at the inner end, as indicated in Figs. 1 and 2. For instance, when it is desired to adjust the screen portion D the bolts I and II for the clamping-frame F are loosened, and before loosening the bolts I the crank-screw J is engaged with the frame F, so as to hold the latter in place when the bolts I are loosened to allow of drawing the screen-cloth portion D downward for swinging a new portion of the screen-cloth over the opening B.

In order to hold the lower auxiliary cla mping-bar G or G in proper position relatively to the corresponding clamping-frame F or I I provide each of the said bars G G with inwardiy-extending lugs G adapted to rest against the front face of the frame B when the bar is in an innermost clamping position, as indicated in Figs. 5 and 7.

When the stamp-mill is in use, the gates O O are held in an open position to permit the fine particles of material reduced to the desired size to pass through the screen-cloth portions D D and when it is desired to remove one of the worn-out screen-cloth portions D or D then the corresponding gate 0 or O is closed to shut off the material from the screen-cloth portion. The bolts I, I, and H are then loosened, as previously described, while the other frame is temporarily engaged and clamped at its inner end by the crankscrew J, and then the operator raises the clamping frame F and draws the screen downward until sufliciently removed, and then the clamping-frame F is lowered to its former position, with the screen between its bottom edge and the bolts H. The bottom portion of the screen is then doubled up over the outer face of the bottom bar of the clamping-frame F and is clamped in this position by the auxiliary bar upon screwing up the bolts II. The screen is then nicely stretched by turning the reel up a notch or two, after which the bolts I I are screwed up, and then the gate is raised and the worn-out portion torn off. Thus it will be seen that it is not necessary to completely stop the battery or take out the entire frame 13 while changing the screen-cloth to remove the worn-out portion and replace it by a new unused cloth. By having two screen-cloths, as described, the operator can change one while the other is in use.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. A screen for stamp-mills, comprising an apertured frame, a roll of screen-cloth mounted above the aperture and having a portion of the cloth extending over the aperture, the said roll being adjustable to bring the roll in firm contact with the front face of the apertured frame, a rectangular clamping-frame for clamping the cloth to the sides top and bottom of the aperture, bolts for adj ustably holding the clamping-frame in place on the apertured frame, and an auxiliary clampingbar on the apertured frame for clamping the lower end of the cloth upon the front face of the bottom bar for the rectangular clampingframe, substantially as shown and described.

2. A screen for stamp-mills, comprising an apertured frame, a roll of screen-cloth mounted above the aperture, and having a portion of the cloth extending over the aperture, the roll being transversely adjustable, to bring the rear part thereof flush with the face of said apertured frame and means for clamping the cloth to the frame, substantially as shown and described.

3. A screen for stamp-mills, comprising an apertured frame, a roll of screen-cloth mounted above the aperture, and having a portion of the cloth extending over the aperture, the roll being transversely adjustable, to bring the rear part thereof flush with the face of said apertured frame, means for locking the roll against accidental unwinding of the cloth and permitting of stretching the extended portion and means for clamping the cloth to the frame, substantially as shown and described.

4. A screen for stamp-mills, comprising a frame having a plurality of apertures,a plurality of separate clamping-frames for'the screen to hold the latter in front of the open ings, a single row of bolts for clamping the adjacent inner ends of said frames in position, a row of bolts for each outer end of a clamping-frame, and a device carried by the apertured frame for temporarily engaging and holding the inner end of either of said clamping-frames, substantially as shown and described.

5. A screen for stamp-mills, comprising a frame having a plurality of apertures, rolls of screen-cloth mounted above the apertures, and having portions of the cloth extending above the apertures, a plurality of separate clamping-frames for said extended portions of thescreen-cloth, a single row of boltsfor screw on the apertured frame, and arranged for temporarily engaging the inner end of either of said clamping-frames, substantially as shown and described.

6. A screen for stamp-mills, provided with a screen-cloth roll having toothed journals at the ends, and supports for said roll, and having toothed transverse members adapted to be engaged by the toothed journals, substantially as shown and described.

7. The combination with the apertured frame on the front of the stamp-mill or mortar, of a roll of screen-cloth mounted above the aperture, means for adjusting said roll to bring its rear face flush with the face of the apertured frame, a rectangular clampingframe to hold the screen-cloth in front of the aperture, means for adjusting the clampingframe, and an auxiliary clamping-bar for the lower end of the screen-cloth, substantially as described.

8. The combination with the apertured skeleton frame on the front of the stamp-mill or mortar, of a plurality of clamping-frames for the screen, to hold the latter in front of the skeleton-frame openings, clamping-bolts for engaging the side bars of the said frames,

the bolts for the adjacent side bars simultaneously engaging the latter, and a clamping-bolt on the said skeleton frame, and adapt ed to engage either of the said clampingframes, substantially as shown and described.

MARTIN RICHARD DRISOOLL.

Witnesses:

OHAs. F. GALL, URBAN ANDREUs. 

